On 8 Feb 2021, at 17:24, BOB KISS <bobkiss@xxxxxxxxxxxxx
<mailto:bobkiss@xxxxxxxxxxxxx>> wrote:
DEAR LAURENCE,
I believe there is an entire category of stand development that
uses glycerin as (at least part of) the developer solvent. Others on the
list using this, please chime in...
CHEERS!
BOB
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
<mailto:pure-silver-bounce@xxxxxxxxxxxxx>
[mailto:pure-silver-bounce@xxxxxxxxxxxxx ;
<mailto:pure-silver-bounce@xxxxxxxxxxxxx>] On Behalf Of Laurence Cuffe
(Redacted sender "cuffe" for DMARC)
Sent: Monday, February 08, 2021 11:30 AM
To: pure-silver@xxxxxxxxxxxxx <mailto:pure-silver@xxxxxxxxxxxxx>
Subject: [pure-silver] Re: More (Semi) Standing Around
I’ve been following this thread with interest. One thought occurred to me,
which was to add a thickening agent to the developer. Two possibilities,
would be either Xanthan Gum, or some form of a sugar syrup, I’m thinking in
terms of an additive which is not madly Ph. sensitive, and which is somewhat
chemical stable.
Has anyone played with these ideas? So far all I’ve got is an interesting
range of colour on BW paper, due, I think, to differences in “agitation”
while applying Lyles golden syrup mixed with Rodinol with a spoon, but no
effective images yet. I think the image colour is due to a range of silver
particle sizes in the emulsion (Mie effect? possibly?). The gum, which I will
play with next, will allow me to make up a developer, and then add the gum,
1% is effective and play from there.
Best
Laurence Cuffe
On 8 Feb 2021, at 15:07, Tim Daneliuk <tundra@xxxxxxxxxxxxxx
<mailto:tundra@xxxxxxxxxxxxxx>> wrote:
On 2/8/21 6:19 AM, BOB KISS wrote:
DEAR TIM,
Thanks so much for doing and posting your extensive testing.
I believe stand development was good enough for the majority of Atget's
photos. Of course, he was probably using plates and his emulsions were
probably more compatible with stand development...just guessing.
Pfft. Who did Aget think he was? Some kind of important photographer? :)
*****BUT, and this is a big BUT, (as it were! LOL!!!) stand development
is supposed to be done horizontally, not vertically. The bromide drag is
due to good ol' Sir Isaac Newton's apple, gravity!!! I am not suggesting
that the very short and widely spaced agitation periods are not beneficial
but you may find they are less necessary if you lay (or even tape) the
film flat, horizontally at the bottom of a tray. You speak of tanks and
holders which leads me to believe that the film is vertical in the
developer.
Yes, I have seen guidance to this effect in other places. People are using
either trays or some sort of tube that holds the film horizontally.
The problem is that I have not figured out how to solve these problems
with tray processing:
- How do I process 4-8 sheets at a time and let them stand?
- How do I avoid emulsion scratches?
I do have a sort of wild idea I want to try. I want to take the insert
from the Yankee tank (which holds film vertically as you note) and
stick it in a large tank *horizontally* thereby attempting to do a
"spaced" stand in a big open tank. If that works, I get both the
proper orientation and the convenience of multi-sheet processing. The only
issue I can see is the possibility of Mr. Newton showing up in a new with
with bromide from the top sheets spilling down into the lower sheets.
Methinks
the trick would be to space the film widely.
--
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